"""
Base test class for OCR functionality across different providers.

This follows the same pattern as BaseLLMChatTest in tests/llm_translation/base_llm_unit_tests.py
"""
import pytest
import litellm
from abc import ABC, abstractmethod


# Test resources
TEST_IMAGE_PATH = "test_image_edit.png"
TEST_PDF_URL = "https://arxiv.org/pdf/2201.04234"


class BaseOCRTest(ABC):
    """
    Abstract base test class that enforces common OCR tests across all providers.
    
    Each provider-specific test class should inherit from this and implement
    get_base_ocr_call_args() to return provider-specific configuration.
    """

    @abstractmethod
    def get_base_ocr_call_args(self) -> dict:
        """Must return the base OCR call args for the specific provider"""
        pass

    @pytest.fixture(autouse=True)
    def _handle_rate_limits(self):
        """Fixture to handle rate limit errors for all test methods"""
        try:
            yield
        except litellm.RateLimitError:
            pytest.skip("Rate limit exceeded")
        except litellm.InternalServerError:
            pytest.skip("Model is overloaded")

    @pytest.mark.parametrize("sync_mode", [True, False])
    @pytest.mark.asyncio
    async def test_basic_ocr_with_url(self, sync_mode):
        """
        Test basic OCR with a public URL.
        """
        litellm._turn_on_debug()
        base_ocr_call_args = self.get_base_ocr_call_args()
        print("BASE OCR Call args=", base_ocr_call_args)

        try:
            if sync_mode:
                response = litellm.ocr(
                    document={
                        "type": "document_url",
                        "document_url": TEST_PDF_URL
                    },
                    **base_ocr_call_args,
                )
            else:
                response = await litellm.aocr(
                    document={
                        "type": "document_url",
                        "document_url": TEST_PDF_URL
                    },
                    **base_ocr_call_args,
                )

            print(f"\n{'='*80}")
            print(f"Sync Mode: {sync_mode}")
            print(f"Response type: {type(response)}")
            print(f"Response object: {response.object if hasattr(response, 'object') else 'N/A'}")
            
            # Check if response has expected OCR format
            assert hasattr(response, "pages"), "Response should have 'pages' attribute"
            assert hasattr(response, "model"), "Response should have 'model' attribute"
            assert hasattr(response, "object"), "Response should have 'object' attribute"
            assert response.object == "ocr", f"Expected object='ocr', got '{response.object}'"
            
            # Validate pages structure
            assert isinstance(response.pages, list), "pages should be a list"
            assert len(response.pages) > 0, "Should have at least one page"
            
            # Check first page structure
            first_page = response.pages[0]
            assert hasattr(first_page, "index"), "Page should have 'index' attribute"
            assert hasattr(first_page, "markdown"), "Page should have 'markdown' attribute"
            
            # Extract text from all pages for validation
            total_text = "\n\n".join(page.markdown for page in response.pages if page.markdown)
            print(f"Total pages: {len(response.pages)}")
            print(f"Total extracted text length: {len(total_text)} characters")
            print(f"First 200 chars: {total_text[:200]}")
            print(f"Model: {response.model}")
            if response.usage_info:
                print(f"Pages processed: {response.usage_info.pages_processed}")
            print(f"{'='*80}\n")
            
            assert len(total_text) > 0, "Should extract some text from the document"

        except Exception as e:
            pytest.fail(f"OCR call failed: {str(e)}")

    def test_ocr_response_structure(self):
        """
        Test that the OCR response has the correct structure.
        """
        litellm.set_verbose = True
        base_ocr_call_args = self.get_base_ocr_call_args()

        response = litellm.ocr(
            document={
                "type": "document_url",
                "document_url": TEST_PDF_URL
            },
            **base_ocr_call_args,
        )

        # Validate response structure
        assert hasattr(response, "pages"), "Response should have 'pages' attribute"
        assert hasattr(response, "model"), "Response should have 'model' attribute"
        assert hasattr(response, "object"), "Response should have 'object' attribute"
        assert hasattr(response, "usage_info"), "Response should have 'usage_info' attribute"
        
        assert isinstance(response.pages, list), "pages should be a list"
        assert len(response.pages) > 0, "Should have at least one page"
        assert response.object == "ocr", "object should be 'ocr'"
        
        # Validate first page structure
        first_page = response.pages[0]
        assert hasattr(first_page, "index"), "Page should have 'index' attribute"
        assert hasattr(first_page, "markdown"), "Page should have 'markdown' attribute"
        assert isinstance(first_page.markdown, str), "markdown should be a string"
        
        print(f"\nResponse structure validated:")
        print(f"  - object: {response.object}")
        print(f"  - model: {response.model}")
        print(f"  - pages: {len(response.pages)}")
        if response.usage_info:
            print(f"  - pages_processed: {response.usage_info.pages_processed}")
            print(f"  - doc_size_bytes: {response.usage_info.doc_size_bytes}")